a) Most lawyers, especially extending credit terms in the startup field, will carry over that debt with interest for years. Call and state your case, make it clear it's no-pay right now either way, but you want to fulfill your obligation in the further - say start making payments in 12 months.
b) RackSpace - you owe personally or through corporation? If personal, call them and have the same conversation - speak with a manager and ask for payment terms outside of normal, otherwise you have to default. If corporate consider folding and walking away, corporate protection is there for a reason and even though it's not a stand-up thing to do, Rackspace's world is littered with bankrupt startups.
c) Visa & MC may be your big problem, getting blacklisted from merchant accounts isn't the end of the world but certainly something to avoid. Also nearly impossible to reach a human that can make decisions on terms. For a startup they should have a 20% merchant reserve on your account anyways, how far does that take you?
Bottom line, think 6 - 12 month terms instead of 12 day terms.
No reason at all you can't get there with the right amount of sucking it up and pleading your case.